java.lang.ClassFormatError: Extra bytes at the end of class file

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在进行Class文件的拷贝时，通过FileInputStream,FileOutputStream进行拷贝操作出错:

java.lang.ClassFormatError: Extra bytes at the end of class file

 

源代码:

 byte buf[] = new byte[256];
 while(fin.read(buf) != -1)
 {
     fout.write(buf);
     ir.read();
 }
 fout.flush();

 

修改后:

 byte buf[] = new byte[256];
 int len = 256;
 while((len = fin.read(buf)) != -1)
 {
     fout.write(buf,0,len);
     ir.read();
 }
 fout.flush();